1990089 has 20 divisors (see below), whose sum is σ = 3020160. Its totient is φ = 1305720.

The previous prime is 1990081. The next prime is 1990103. The reversal of 1990089 is 9800991.

It is not a de Polignac number, because 1990089 - 2³ = 1990081 is a prime.

1990089 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6244 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (151008).

2^1990089 is an apocalyptic number.

It is an amenable number.

1990089 is a deficient number, since it is larger than the sum of its proper divisors (1030071).

1990089 is an equidigital number, since it uses as much as digits as its factorization.

1990089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1990089 is about 1410.7051428275. The cubic root of 1990089 is about 125.7836423050.

The spelling of 1990089 in words is "one million, nine hundred ninety thousand, eighty-nine".